22) How to Check your Salesforce instance

1) URL

• In screenshot above this is ap1 instance.
• while production instance for America instances start with NA, APAC instances start with AP, and EMEA instances start with EU
•  Sandbox instance always start with CS
• click here to see more instances
• you want to know which instance your using simply click the link  in the link you have to mention the domain name and click on find button. 

2) SOQL : SELECT InstanceName, IsSandbox FROM Organization